Prevent IE11 caching GET call in Angular 2

Question

I have a rest endpoint that returns a list on a GET call. I also have a POST endpoint to add new items and a DELETE to remove them. This works in Firefox and Chrome, and the

Answer 1

Edit: See comment below - this is not necessary (in the vast majority of cases).

Expanding on Jimmy Ho's answer above, I only want to prevent caching of my API calls, and not other static content which will benefit from being cached. All of my API calls are to URLs that contain "/api/", so I amended Jimmy Ho's code with a check that only adds the cache headers if the requested URL contains "/api/":

import { HttpHandler,
    HttpProgressEvent,
    HttpInterceptor,
    HttpSentEvent,
    HttpHeaderResponse,
    HttpUserEvent,
    HttpRequest,
    HttpResponse } from '@angular/common/http';
import { Observable } from 'rxjs/Observable';

export class CustomHttpInterceptorService implements HttpInterceptor {
    intercept(req: HttpRequest, next: HttpHandler):
    Observable | HttpUserEvent> {
    // Only turn off caching for API calls to the server.
    if (req.url.indexOf('/api/') >= 0) {
        const nextReq = req.clone({
            headers: req.headers.set('Cache-Control', 'no-cache')
                .set('Pragma', 'no-cache')
                .set('Expires', 'Sat, 01 Jan 2000 00:00:00 GMT')
                .set('If-Modified-Since', '0')
        });

        return next.handle(nextReq);
    } else {
        // Pass the request through unchanged.
        return next.handle(req);
    }
}

}